Just a suggestion, I solved this issue a couple of months ago, which was suggested by some users in our forum.
Delete dstorage.dll and dstorage.dll.bak from C:\Program Files (x86)\Diablo IV. Somehow after doing so, it runs pretty stable.
Try it at your own risk, at most, just repair/reinstall a copy.
This worked for me, lemme know if this helps!
I am on an RTX4070
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